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Tim went swimming in the sea.
He had a room overlooking the sea.
We're renting a house by the sea (=close to the sea).
I ran across the beach and into the sea.
Some older tankers need maintenance while at sea.
Most of his belongings will be transported by sea.
She rowed the boat out to sea.
A service was held to commemorate those lost at sea.
The cruiser put to sea yesterday from the port of Murmansk.
The yacht was on the open sea in light winds.
This is the British English definition of sea. View American English definition of sea.
a substance that scientists think exists out in space, but for which they have no direct proof